Aer Lingus, (/ˌɛər ˈlɪŋɡəs/, an anglicisation of the Irish aerloingeas meaning "air fleet") is the flag carrier airline of Ireland and the second-largest airline in Ireland. Founded by the Irish government, it was privatised between 2006 and 2015 and it is now a wholly owned subsidiary of International Airlines Group (IAG), the parent company of British Airways and Iberia. The airline's head office is on the grounds of Dublin Airport in Cloghran, County Dublin, Ireland.

Formed in 1936, Aer Lingus is a former member of the Oneworld airline alliance, which it left on 31 March 2007; however, after the takeover by IAG it is expected that Aer Lingus will re-enter Oneworld in the foreseeable future. The airline has codeshares with Oneworld, Star Alliance and SkyTeam members, as well as interline agreements with Etihad Airways, JetBlue Airways and United Airlines. Aer Lingus has a hybrid business model, operating a mixed fare service on its European and North African routes and full service, two-class flights on transatlantic routes.

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